What is cover cropping?
Cover cropping is a practice that is increasingly being recognised for its benefits in regenerative and sustainable agriculture research around the world. Essentially, it refers to the planting of a non-cash crop, commonly called a cover crop, in between the periods of main crop production, such as between a summer crop and the following year’s crop.
The primary aim of cover cropping is to protect and improve the soil by maintaining a plant cover on the soil surface throughout the year. This stops wind erosion and water erosion, which can blow away or wash away valuable topsoil. Cover crops, like cereal grains, legume cover crops, and broadleaf crops, provide this soil protection. Other cover crops include grass cover crops such as winter rye, cereal rye, winter wheat, and annual ryegrass, which can also provide soil protection.
Additionally, these cover crops can enhance soil health and soil quality in a number of ways. Their root systems, particularly those of deep-rooted cover crops, can help to break up compacted soil layers, improving soil structure and capturing nutrients deep in the soil profile.
Legumes as Nitrogen Fixers
Leguminous cover crops, like hairy vetch, crimson clover, and Austrian winter peas, are capable of nitrogen fixation, adding valuable nutrients to the soil and boosting soil fertility. This can reduce nutrient loss and lessen the risk of water pollution. Furthermore, they can also improve soil moisture retention and water infiltration. Improved soil moisture increases water availability and potentially improves water quality.
Cover cropping and weed control
Planting cover crop seeds, typically in early fall or late summer, can also aid in weed control. The cover crops can outcompete and smother weeds. Certain cover crop species can even help control pests by attracting insects and other beneficial organisms. This can enhance the overall health of the farming system and contribute to biodiversity.
Soil Carbon Sequestration
Cover crops also have the potential to contribute to climate change mitigation. They can sequester carbon in the soil, increasing soil organic matter levels. Furthermore, plant residue left after cover crops can act as green manure crops. This can provide additional organic matter and nutrients to the soil.
Cover cropping planning
However, cover crop species selection and planting dates are critical for the best results. The cover crop must be suitable for the specific climate and must be sown at the appropriate time. For instance, cereal rye and winter wheat are common cover crops sown post-harvest. On the other hand, crops like hairy vetch and crimson clover may be planted as an intercrop or pre-plant cover crop.
For the successful use of cover crops, good seed-to-soil contact is necessary to ensure the best germination rates. It’s also important to terminate the cover crop at the right time to ensure that it doesn’t compete with the subsequent crop.
Benefits of Cover Cropping
The environmental benefits of cover crops are numerous, and there is current research that also indicates possible financial advantages for farmers who adopt this practice. Cover crops can improve the soil’s ability to support primary cash crop growth, improve net profit, and potentially boost cash crop yields.
In conclusion, cover cropping offers a host of other benefits for conservation purposes and overall agricultural systems. They can improve soil health, manage pests and weeds, provide ground cover, and even offer a climate change solution. Cover cropping is a cultural practice that could provide significant benefits for the future of farming. However, it’s important for farmers to access additional information, education programs, and current research to ensure they get the best from this method of regenerative farming.